A torn ACL can change how your knee moves
The anterior cruciate ligament (ACL) is one of the major stabilising ligaments inside the knee.
It helps control forward movement and rotational stability of the tibia relative to the femur.
ACL injuries are common in sports involving sudden stopping, pivoting, cutting or landing. They can occur with or without contact.
What does an ACL injury feel like?
Some patients describe:
- A sudden “pop”
- Immediate pain
- Rapid knee swelling
- Difficulty continuing the activity
- A feeling that the knee is unstable
- Difficulty changing direction
- Recurrent giving-way episodes
How does an ACL tear happen?
Common mechanisms include:
- Sudden change of direction
- Pivoting
- Awkward landing
- Sudden deceleration
- Hyperextension
- Contact injury
How is an ACL injury diagnosed?
Diagnosis involves clinical examination and imaging when appropriate.
Clinical assessment may include:
- Lachman test
- Pivot-shift assessment
- Anterior drawer test
- Range of motion
- Swelling
- Evaluation of other knee ligaments
- Meniscal examination
Does every ACL tear require surgery?
No. Some patients can function well without reconstruction, particularly when their lifestyle does not demand significant pivoting activity and the knee remains functionally stable.
Treatment depends on
- Age
- Activity level
- Knee stability
- Associated injuries
- Occupational demands
- Sports participation
- Patient goals
- Response to rehabilitation
When is ACL reconstruction considered?
Reconstruction may be considered when there is:
- Persistent symptomatic instability
- Desire to return to pivoting sports
- Recurrent giving-way
- Associated meniscal or ligament injury requiring surgery
- Functional demands that cannot be met with rehabilitation alone
For many active patients, reconstruction is considered to restore functional stability.
Why is rehabilitation important before surgery?
An ACL-injured knee may be swollen and stiff immediately after injury.
What is ACL reconstruction?
ACL reconstruction replaces the torn ligament with a graft.
Common graft choices include:
- Hamstring tendon
- Bone-patellar tendon-bone
- Quadriceps tendon
- Other graft options in selected situations
What happens after ACL reconstruction?
Rehabilitation is a major component of treatment.
It usually progresses through:
- Swelling control
- Restoration of movement
- Quadriceps activation
- Progressive strengthening
- Balance and neuromuscular training
- Running progression
- Jumping and landing
- Cutting and pivoting drills
- Sport-specific rehabilitation
- Return-to-sport assessment
Can an ACL tear heal by itself?
The ACL has limited intrinsic healing potential after complete rupture, and persistent instability can occur.
Frequently Asked Questions
Can I walk with a torn ACL?
Yes. Some patients can walk relatively well after the initial injury, particularly once swelling settles.
Does every ACL tear need surgery?
No. Selected patients can be managed with rehabilitation and activity modification.
Can I play football after an ACL tear without surgery?
Some patients may return to activity, but sports involving pivoting and cutting place high demands on an unstable knee. Individual assessment is important.
Does an ACL tear always cause arthritis?
An ACL injury can be associated with later degenerative changes, particularly when accompanied by meniscal or cartilage injury and recurrent instability.
How long does ACL recovery take?
Recovery is typically measured in months and depends on the reconstruction, associated injuries, rehabilitation and functional milestones.
Consultation
An ACL injury should be assessed not only for the ligament tear itself but also for associated meniscal, cartilage and other ligament injuries.
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